LEMON Manuals: Even more car manuals for everyone
Home >> BMW >> 2021 >> M4 Competition >> Repair and Diagnosis >> Electrical >> Gauges >> Body Equipment -- Repair M4 (1 Of 2) (G82 & G83) >> 51 21 Door Locks, Handles, Fittings, Front >> 51 21 140 Removing and installing/replacing the complete lock cylinder on the left or right front door (M4 2021-2023) >> Replacing lock cylinder

Replacing lock cylinder

WARNING: Working on 12 V electrical system. 
Risk of short circuits! Risk of fire! 
  • Make sure that there is no charger  connected to the jump start terminal in the engine compartment.
  • Detach battery ground lead from battery.
  • For auxiliary batteries: Detach battery minus cables from all auxiliary batteries.
NOTE: Description is for left component only. Procedure on the right side is identical.

Preliminary work 

Follow-up work